我知道HTTP/2 Client provided by Java 9,并在尝试使用以下代码的孵化器模块时:

// Request builder
URI uri = new URI("http://www.stackoverflow.com/"); // using www.google.com gives me some payload with no exception
HttpRequest request = HttpRequest.newBuilder().uri(uri).GET().build();

// Client
HttpClient httpClient = HttpClient.newBuilder().followRedirects(HttpClient.Redirect.ALWAYS).build();
System.out.println(httpClient.version());

// Response builder
HttpResponse response = httpClient.send(request, HttpResponse.BodyHandler.asString());

System.out.println("statusCode = " + response.statusCode()); // 200 for google.com

我收到此作为输出:
Exception in thread "main" java.io.IOException: /192.168.0.2:60726: GOAWAY received
  at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.handleGoAway(Http2Connection.java:613)
  at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.handleConnectionFrame(Http2Connection.java:531)
  at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.processFrame(Http2Connection.java:466)
  at jdk.incubator.httpclient/jdk.incubator.http.internal.frame.FramesDecoder.decode(FramesDecoder.java:114)
  at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection$FramesController.processReceivedData(Http2Connection.java:152)
  at jdk.incubator.httpclient/jdk.incubator.http.Http2Connection.asyncReceive(Http2Connection.java:425)
  at jdk.incubator.httpclient/jdk.incubator.http.AsyncSSLDelegate.upperRead(AsyncSSLDelegate.java:557)
  at jdk.incubator.httpclient/jdk.incubator.http.internal.common.Queue.put(Queue.java:73)
  at jdk.incubator.httpclient/jdk.incubator.http.AsyncSSLDelegate.asyncReceive(AsyncSSLDelegate.java:503)
  at jdk.incubator.httpclient/jdk.incubator.http.PlainHttpConnection.asyncRead(PlainHttpConnection.java:300)
  at jdk.incubator.httpclient/jdk.incubator.http.PlainHttpConnection$ReadEvent.handle(PlainHttpConnection.java:395)
  at jdk.incubator.httpclient/jdk.incubator.http.HttpClientImpl$SelectorManager.handleEvent(HttpClientImpl.java:438)
  at jdk.incubator.httpclient/jdk.incubator.http.HttpClientImpl$SelectorManager.run(HttpClientImpl.java:408)

向下移动堆栈跟踪,我可以发现GOAWAY被列为以下类型之一
jdk.incubator.http.internal.frame.Http2Frame

但是内部类的文档却很少,无法确切地找到此类型代表什么。我也尝试在JEP的链接上搜索相同的内容,但找不到任何内容。

问:什么是GoAway框架?何时以及如何使用?

问:为什么如果我更改代码以使用客户端而不进行尝试获取GET“stackoverflow.com”的重定向,却不会遇到相同的异常?
HttpClient httpClient = HttpClient.newBuilder().build();

最佳答案

specifications中所设置,

GOAWAY帧(类型= 0x7)用于启动连接的关闭或发出严重的错误情况信号

服务器可能在第二个连接上发送了该帧,重定向之后是第二个连接。

stackoverflow.com上的所有URL是否都接受http / 2连接?当查看我的HTTP / 2-SPDY浏览器插件的指示器时,情况似乎并非如此。

09-10 09:22
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